Closed
Description
I compiled this program with a rustc
tip build:
//#![feature(unmarked_api)]
#![feature(io)]
struct Blah;
impl Writer for Blah {
fn write_all(&mut self, buf: &[u8]) -> std::old_io::IoResult<()> {
Ok(())
}
}
fn f2() -> i32 {
let mut blah: Blah = Blah;
std::rt::backtrace::write(&mut blah).unwrap();
99
}
fn f1() -> i32 {
f2()
}
fn main() {
println!("{}", f1());
}
and got this in the output:
b.rs:14:5: 14:30 error: use of unmarked library feature
b.rs:14 std::rt::backtrace::write(&mut blah).unwrap();
^~~~~~~~~~~~~~~~~~~~~~~~~
b.rs:14:5: 14:30 note: this is either a bug in the library you are using and a bug in the compiler - please report it in both places
b.rs:14 std::rt::backtrace::write(&mut blah).unwrap();
^~~~~~~~~~~~~~~~~~~~~~~~~
b.rs:14:5: 14:30 note: use #![feature(unmarked_api)] in the crate attributes to override this
b.rs:14 std::rt::backtrace::write(&mut blah).unwrap();
BTW, the "and" in the first note probably should be an "or", to match the "either".